![Artemy Kovalyov](/assets/img/avatar_default.png)
Currently ODP MR may explicitly register virtual address space area of limited length. This change allows MR to cover entire process virtual address space dynamicaly adding/removing translation entries to device MTT. Add following changes to support implicit MR: * Allow umem to be zero size to back-up implicit MR. * Add new function ib_alloc_odp_umem() to add virtual memory regions to implicit MR dynamically on demand. * Add new function rbt_ib_umem_lookup() to find dynamically added virtual memory regions. * Expose function rbt_ib_umem_for_each_in_range() to other modules and make it safe Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com>
174 lines
5.4 KiB
C
174 lines
5.4 KiB
C
/*
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* Copyright (c) 2014 Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef IB_UMEM_ODP_H
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#define IB_UMEM_ODP_H
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#include <rdma/ib_umem.h>
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#include <rdma/ib_verbs.h>
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#include <linux/interval_tree.h>
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struct umem_odp_node {
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u64 __subtree_last;
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struct rb_node rb;
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};
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struct ib_umem_odp {
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/*
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* An array of the pages included in the on-demand paging umem.
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* Indices of pages that are currently not mapped into the device will
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* contain NULL.
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*/
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struct page **page_list;
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/*
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* An array of the same size as page_list, with DMA addresses mapped
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* for pages the pages in page_list. The lower two bits designate
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* access permissions. See ODP_READ_ALLOWED_BIT and
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* ODP_WRITE_ALLOWED_BIT.
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*/
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dma_addr_t *dma_list;
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/*
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* The umem_mutex protects the page_list and dma_list fields of an ODP
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* umem, allowing only a single thread to map/unmap pages. The mutex
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* also protects access to the mmu notifier counters.
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*/
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struct mutex umem_mutex;
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void *private; /* for the HW driver to use. */
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/* When false, use the notifier counter in the ucontext struct. */
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bool mn_counters_active;
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int notifiers_seq;
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int notifiers_count;
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/* A linked list of umems that don't have private mmu notifier
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* counters yet. */
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struct list_head no_private_counters;
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struct ib_umem *umem;
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/* Tree tracking */
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struct umem_odp_node interval_tree;
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struct completion notifier_completion;
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int dying;
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struct work_struct work;
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};
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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
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int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem);
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struct ib_umem *ib_alloc_odp_umem(struct ib_ucontext *context,
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unsigned long addr,
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size_t size);
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void ib_umem_odp_release(struct ib_umem *umem);
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/*
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* The lower 2 bits of the DMA address signal the R/W permissions for
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* the entry. To upgrade the permissions, provide the appropriate
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* bitmask to the map_dma_pages function.
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*
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* Be aware that upgrading a mapped address might result in change of
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* the DMA address for the page.
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*/
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#define ODP_READ_ALLOWED_BIT (1<<0ULL)
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#define ODP_WRITE_ALLOWED_BIT (1<<1ULL)
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#define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT))
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int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 start_offset, u64 bcnt,
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u64 access_mask, unsigned long current_seq);
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void ib_umem_odp_unmap_dma_pages(struct ib_umem *umem, u64 start_offset,
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u64 bound);
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void rbt_ib_umem_insert(struct umem_odp_node *node, struct rb_root *root);
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void rbt_ib_umem_remove(struct umem_odp_node *node, struct rb_root *root);
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typedef int (*umem_call_back)(struct ib_umem *item, u64 start, u64 end,
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void *cookie);
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/*
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* Call the callback on each ib_umem in the range. Returns the logical or of
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* the return values of the functions called.
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*/
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int rbt_ib_umem_for_each_in_range(struct rb_root *root, u64 start, u64 end,
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umem_call_back cb, void *cookie);
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/*
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* Find first region intersecting with address range.
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* Return NULL if not found
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*/
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struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root *root,
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u64 addr, u64 length);
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static inline int ib_umem_mmu_notifier_retry(struct ib_umem *item,
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unsigned long mmu_seq)
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{
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/*
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* This code is strongly based on the KVM code from
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* mmu_notifier_retry. Should be called with
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* the relevant locks taken (item->odp_data->umem_mutex
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* and the ucontext umem_mutex semaphore locked for read).
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*/
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/* Do not allow page faults while the new ib_umem hasn't seen a state
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* with zero notifiers yet, and doesn't have its own valid set of
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* private counters. */
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if (!item->odp_data->mn_counters_active)
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return 1;
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if (unlikely(item->odp_data->notifiers_count))
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return 1;
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if (item->odp_data->notifiers_seq != mmu_seq)
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return 1;
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return 0;
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}
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#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
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static inline int ib_umem_odp_get(struct ib_ucontext *context,
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struct ib_umem *umem)
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{
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return -EINVAL;
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}
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static inline struct ib_umem *ib_alloc_odp_umem(struct ib_ucontext *context,
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unsigned long addr,
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size_t size)
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{
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return ERR_PTR(-EINVAL);
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}
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static inline void ib_umem_odp_release(struct ib_umem *umem) {}
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#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
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#endif /* IB_UMEM_ODP_H */
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